Details

Autor(en) / Beteiligte

• Banerjee, S.
• Naik, U.M.

Titel

Plastic instability in an omega forming Ti-15% Mo alloy

Ist Teil von

• Acta materialia, 1996-09, Vol.44 (9), p.3667-3677

Ort / Verlag

Oxford: Elsevier Ltd

Erscheinungsjahr

1996

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The plastic flow behaviour of a β-titanium alloy (Ti-15% Mo) was investigated over a wide range of temperatures and strain rates covering those conditions where the ω-phase forms dynamically. Portevin-Le Chatelier (PLC) effect was observed in this alloy at temperatures between 575 and 775 K at a strain rate of 1.31 × 10−4 s−1. The serrated flow behaviour of this alloy could be suppressed by rendering the matrix β-phase more stable against the β to ω transformation. PLC bands formed in this alloy, studied at different levels of magnification using light, scanning electron and transmission electron microscopy, showed a high density of deformation bands within the macroscopic PLC band. The following mechanism of serrated flow is proposed: the load drop is ascribed to the sudden flow associated with the formation of deformation bands within which ω-particles were destroyed while the subsequent load rise results from pinning of dislocations by ω-particles forming dynamically.